Harvester pitman connection.



N0.`7ao,o 2`2. PATENTEDJUNBZ, 1903.'

M B. A. JOHNSTON;

HARVESTER PITMAN CONNECTION.

APPLIoATIon-LILBD s nrfr. 1s, 1902.4 v No Mopm.. 2 en nnTs-sHn-nzr1-.

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No. 730,022. l

, ELA'.JOHNSTON.

-HARVBSTBRVPITMAN coNNBcTIoN.

APPLIOATIOB FILED SEPT. 18, 1902.

SHEETS-SHEET a.

No MODEL.

TN: nofws PETERS oo. Fumoufno.; wAsNmGTN; u c.

UNITED STATES Patented J une 2, 1903.

PATENT OFFICE.

TIONAL HARVESTER COMPANY, TION OF NEW JERSEY.

OF CHICAGO, ILLINOIS, A CORPORA` HARVESTER PIYTMAN CONNECTION.

SPECIFICATION forming part of Letters Patent No. 730,022, dated June 2, 1903. Application filed September 1S, 1902. Serial Nol123,904=. (No model.)

To all whom it 'may concern: v

Be it known that I, EDWARD A. JoHNs'roN', a citizen of the United States, residing in the city of Chicago, county of Cook, State of Illinois, have invented certain new and useful Improvements in I-Iarvester-Pitmen Connections; and I do hereby declare the following to be a full, clear, and exact description of the iii-- vention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates toA pitmen conuections, and pertains more particularly to connecting devices to be employed in coupling the reciprocating pitmen to the knife-heads of harvesters, mowers, and the like.

The object of my invention is to provide a pitman connection that may be quickly operated to couple and uncouple the cooperating parts without the use of tools and that will automatically take up the wear between the journal of the pitman and the knife-headwithout allowing any yield vin the connection in the line of the thrust 'of the pitman. 'i

The invention is illustrated in the accompanying drawings, in which- Figure l is a plan view of the knife-head and pitman with my invention applied there-` to. Fig. 2 is a sectional view showing the pitman removed from the knife-head and the connector in released position. Fig. 3 illustrates the construction of the tapered hook-shaped end of the pitman. Fig. 4 is a horizontal sectional view of the knife-head bearing and the connector, showing the pitman and knife-head coupled in operative relation. Fig. 5 is a corresponding View showing the manner of releasing the connector. Fig. 6 is a perspective view of one-half of the connector.

Referring to the drawings, reference character a indicates a knife-head of a type ordinarily employed in harvesters, mowers, and the like, which knife-head 'is provided with the usual circular bearing b, by which the knife-head is connected with the reciprocating mechanism. The pitman c,'which is connected to the knife-head to reciprocate the latter, is provided at its forward portion with a lateral projection or hook-shaped end c',

two faces-of which are tapered or beveled, as

clearlyindicated in Figs. 2 and 3.

Inorder to provide a journal for thepitman asthus constructed, which journal will find an easy and self-adjustable 4bearing in .the knife-head, I construct a connector of two lndrical recess dwhich recesses cooperate when'the sectionsare brought together to form a seat for a spiral spring e.

' The normal operative relation of the several parts of the apparatus described above is illustrated in Figs. l and 4, in which the tapered head c' of the pitman c occupies the ,tapered recess formed by the two sections d d of the connector, the journal end of which occupies the bearing b of the knife-head and is held in close contact therewith by the wedgving action of the cooperating tapers on the pitman end and the inner surfaces of the journal-sections. The tapered hook-shaped end of the pitman is held firmly within the recess of the connector-sections by means of a spiral spring e, which bears upon the side of the pitman opposite the hook-shaped en d and rests within the cup-shaped ,depression formed by the recess d6.

To apply the connector as above describedto its intended use, the hook-shaped end c of the pitman o is threaded through the lateral opening d4 in one ofthe connector-sections and turned until the tapered end c' thereof occupies the tapered recess formed between; the mating coupler-sections, whilethe spring e is compressed between the side of l.the pitman and the hinged end of the coupler. The hook-shaped end of the pitman is then forced The lower end of each section has'a s'emicytoward the hinged end of the coupler, and the sections of the coupler are compressed or brought together, as indicated in Fig. 5, until IOO the flanges d? on the upper end of the sections will pass freely through the bearing 7J in the knifehead- The coupler then threaded through the bearing untilsaid iianges di pass beyond the edge of the bearing, after which the lateral pressure upon the couplersections is released and spring c forces the hook-shaped endv c into the forward tapered recess of the coupler, with the result that the tapered sides of the liool sl1aped pitman end force the journal -sections apart until the flanges d'l overlap both edges of the bearing l) and the journal-sections d of the coupler lit snugly within the said bearing. The spring c, constantly reacting between the pitman and the end of the coupler, holds the tapered pit man end firmly upto its work, and it will be noted that any wear between the journal and the bearing l) will be immediately taken up by the wedging action of the pitm an end forcing the coupler-sections farther apart.

It will be noted that the connection is adapted to be quickly applied to or removed from the bearing of the knife-head without the use of special tools; also that the connection is preferably rigid in the line of the pitman and allows no yield whatever in response toits thrust. To remove or release the con neetions, it is only necessary to withdraw the hook-shaped end c of the pitman from `its en gagement with the tapered recess between the coupler-sections by moving the end of the pitman against the tension oi the spiral spring e and then forcing the journal ends of the sections toward each other until the outer flanges d? thereof clear the inner edges of the bearing l), after which the Coupler may be pulled through the bearing b, as indicated in Fig. 5. The coupler may then be removed from the pitman end for adjustment or repair, after which it may be readily and easily applied again to its intended use by an unskilled workman without the use of special tools.

Having thus described'my invention, what I claim isl. Apitman connection, comprising alongitudinally-divided journal having a tapered recess between the sections thereof, a pitman having a tapered end, and means to re tain the tapered pitman end in engagement with the recess, whereby the journal is expanded within its bearing.

A pitman connection, comprising a longitudinally-divided jolirnal, having a tapered recess between the sections thereof, a pitman having a tapered end, and a spring interposed between the journal. and the pitman end to force the tapers of the journal-sections and the pitman end together, whereby said journal is expanded within its bearing.

3. A pitman connection, comprising an expansible journal formed of two sections, pivoted together at one end, and provided Awith a tapered recess at the other, a pitman having a tapered hook-shaped end engaging the recess between the pivoted sections, and a spring located between the pitman end and the pivoted end of the journal, whereby the tapered pitman end is i'orced within the recess in the journal to expand the sections.

l. A pitman connection, comprising an ex pansible journal formed of two sections, pivoted together at one end, and provided with a tapered recess at the other, there being flanges on the respective sections adapted to retain the journal within the bearing, a pitman having a tapered hook-shaped end on the pitman engaging the recess between the pivoted sections, and a spring interposed be tween the pitman end and the pivoted end ot' the journal to force the pitman end within the recess and expand the journal within the bearing.

5. A pitman connection, comprising a longitinlinally-sectional journal, having a tapered recess between the sections, apitman having a corresponding tapered end, and a spring normally forcing the end of the pitman into the tapered recess to take up wear, therecess, the pitman end and the direction ol the reaction of the spring being in a line transverse to the pitman so as to prevent j/'ielding of the connection in response to the thrust ot' the pitman.

In testimony whereof I aliix my signature in presence of two witnesses.

EDVARD A. JOHNSTON.

Witnesses:

N. CHAMBERs, \VM. TWOMBLY. 

